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OBJECTIVE Atrial fibrillation is the most common arrhythmia after cardiac surgery. Several studies have shown the impact of vitamin D on heart disease; however, there have been few studies for the incidence of AF and its relationship with vitamin D levels. According to the different results of these studies, we decided to evaluate the relation of plasma(More)
Let G be a graph of order n and let µ be an eigenvalue of multiplicity m. A star complement for µ in G is an induced subgraph of G of order n − m with no eigenvalue µ. In this paper, we study maximal and regular graphs which have K r,s + tK 1 as a star complement for 1 as the second largest eigenvalue. It turns out that some well known strongly regular(More)
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